Coexistence of superconductivity and magnetism in CaK(Fe\(_{1-x}\)Ni\(_x\))\(_4\)As\(_4\) as probed by \(^{57}\)Fe Mössbauer spectroscopy

• Published in: arXiv.org
• Main Authors: Bud'ko, Sergey L, Kogan, Vladimir G, Prozorov, Ruslan, Meier, William R, Xu, Mingyu, Canfield, Paul C
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 16.10.2018
• Subjects: Hyperfine structure; Iron; Magnetic moments; Magnetism; Mossbauer spectroscopy; Nickel; Order parameters; Specific heat; Spectrum analysis; Spin density waves; Superconductivity; Temperature dependence; Transition temperature

Temperature dependent \(^{57}\)Fe M\"ossbauer spectroscopy and specific heat measurements for CaK(Fe\(_{1-x}\)Ni\(_x\))\(_4\)As\(_4\) with \(x\) = 0, 0.017, 0.033, and 0.049 are presented. No magnetic hyperfine field (e.g. no static magnetic order) down to 5.5 K was detected for \(x\) = 0 and 0...